Piston for internal-combustion engines



Sept. 18, 1923, 1,468,586 H. A. WEEKS PISTON FOR INTERNAL COMBUSTION ENGINES Filed Aug. 5, 1922 Patented Sept. 18, 1923.

nane noon A. WEEKS, or vvniran'nns, nonrn CAROLINA.

PISTON FOR INTERNAL-COMBUSTION ENGINES.

Application filed August 3,

T 0 all whom it may concern:

Be it known that I, HUGH A. WEEKS, a citizen of the United States, residing at VVhitakers, in the county of Edgecombe and State of North Carolina, have invented certain new and useful Improvements in Pistons for Internal-Combustion Engines, of which the following is a specification.

My present invention relates to improvements in hollow metallic pistons for internal combustion engines, and it is intended to provide a special arrangement of piston of cheap, simple and eflicient construction which is adapted to receive the ordinary piston packing rings and will cause them to scrape the excess of lubricant from the interior of the cylinder and direct it through suitable channels into the hollow interior of the piston, as will be hereinafter more fully described. 7

My invention will be more fully under stood after reference to the accompanying drawings, in which like parts are indicated by similar reference symbols throughout the several views, and in which Figure 1 is a side elevation of the cylinder with the wrist pin and connecting rod removed.

Figure 2 is a similar view to Fig. 1, except that the skirtof the piston is also shown in section, and the wrist pin and connect-V ing rod in elevation.

Figure 3 is a similar view to Fig. 2, except that the section through the skirt of the iston is at right angles to that shown in i ,22, and the wrist pin is shown irrelevation, and the head of the connecting rod in section; and

Figure 4 shows a section along the broken line 4-4; of Fig. 1, and looking in the direction of the arrows.

A represents the body of the piston, which is hollowed out in the usual way as at In this piston the wrist pin E is mounted in the usual way, and the head of the connecting rod C is mounted on the wrist pin in the usual way. 7 V

As the invention relates exclusively to the construction of the piston,;and it 'is desired to so construct the piston that it may be used with any of the well knowntypes of piston packing rings, such packing rings are not shown; but the piston head is provided with grooves a and a to receive such packing 1922. Serial No. 579,536.

rings, which grooves are separated by the annular flange a Obviously there may be one or more of these grooves.

Below the lower groove the flange a is provided, which is of slightly less diameter than the flange a and this flange has its lower surface preferably rounded somewhat like the Zone of a sphere, as shown most clearly in Figs. 2 and 3.

Below this flange the upper edge of the skirt of the piston is cut away in curves or scalloped, as at a and at the base of each of these curves there is a downwardly and inwardly projecting inclined perforation a which perforation connects the pocket a, formed by the lower edge of the curve a, with the hollow interior of the piston. In Fig. l I have shown one of these pockets c in plane, and the other pockets in dotted lines to correspond with the broken section line 4l4- of Fig. 1.

The operation of the device will be as follows:

The piston being supplied with suitable packing rings, these packing rings will scrape the excess of lubricant off the interior of the cylinder, and this excess would accumulate in the pockets a and would find its way, through the perforations a into the hollow portion A of the piston, and would fall down towards the crank shaft in the usual way. By this special arrangement the excess of lubricant is scraped off from the inner walls of the cylinder and is especially directed towards and'conveyed into the hollow chamber A in the piston and falls downwards in the usual way.

While I have shown the invention in its preferred form, it will be obvious that minor changes might be made in the construction and arrangement of parts which could be used without departing from the spirit of" xny invention; and I'do not. meanzito limit the invention to such details except as par ticularly pointed out in the claim. 5

Having thus described my invention what I claim and desire to secure by Letter Patent of the United States is A hollow piston for use in internal combustion engines provided with anvannular groove having an annular flange above said groovev rectangular in cross section, and an annular flange below said groove of smaller. diameter than the annular flange above the said pockets with the interior ofthe piston, the bottom Wall of said pockets being at right angles to the axi sgof-the pistomrthere- 10 Q by forming a ledge wherebythe'excess oil trapped and'directed to the interiorof ethe piston. V r I v "HUGH A. WEEKS' 

